The day I put it in I could feel the change in performance. I was told at Grace Performance in Kimball, Mi. that he didn't have the size for my engine. Now he sells performance parts for A.T.V.s, Boats, Motorcycles and is a honest guy. At the time I was just asking if he had heard of K&N? He just looked at me and said that's what I use. So even though he didn't sell them at the time he told me too get the best. Thanks Grace Performance you were right and honest.